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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eab0d235e451e4fc426d3d9d2e8df0c9262587103595ac0f3d92b336ab989a3' 
  AND token = 'B2TK0imk4vdK4Dabk37m9Q1TEcMkdawrQIOSL7mwOPU=' 
  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"
    }
  }
}