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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bae67d4c5a78937f2ffd88a4a3e46065f7fdf5fc80ce5342735b4755dcb5b3' 
  AND token = 'F/L9OENxdYpiH6jZde15KUd0U1HmeTR2sbQTNi5JWao=' 
  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"
    }
  }
}