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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca461f17dbdcbf26b2064ee878309b6d4b37c9942730e2028f226600924047d2' 
  AND token = '4w3VRa0ZEP02bk5yml7VETgqKfnAHHGP14gzrcOrmXk=' 
  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"
    }
  }
}