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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a8ea8e4cfc31d32e348ea2a32b691bb61ea04b3ac87fc375fef2703a32e102' 
  AND token = 'Zo52WeMZhQpZEjeNr/8OK7h5GKce0Hpn4vK7Vxw6Ac0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}