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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe112210d424f996f55a3165fb9491fcf4825f0b9daee29a4c4521b7c8d1ce6' 
  AND token = '9rbMJt/bDHX/edgInL61IKOkVSQx0aBcnyT3IQ1YmH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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