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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bafd310b9a77c50d1478a7e0f511de357840fdfa948635ad1985396e4f465c' 
  AND token = '6EIO/H1QTUA+9N9habtiVDtJ7qCS8aSZES7gbU2tezg=' 
  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"
    }
  }
}