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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d95656207791e6d16cadf3b45726d01fa97d58d11eeae89b5f873ab4b8bdaa1' 
  AND token = 'f/7Ud1IR1F4xPIT9jwlJ6gHAk2i0wT1sR/ta8uAz4SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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