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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8cf1053a8c6cb5225631ffdb8660fd17c49801b9a9a4407447a7e1684ae9bd' 
  AND token = 'KoQuI15Ga26Ke1g6PHI4GsGJTw2KCMe1pEolA1KyoaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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