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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4333a54597ade3ee9882f47f7f68af001e2c2d593262da536eaba42fb0ef92d2' 
  AND token = 'qh5wRIzM2BIy2nLSH0L6O9mA+loAio05RrD5anQJI80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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