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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e489306a5b7421e9fac155a339099541ca337ac9f93cfde197082c07e76a394d' 
  AND token = 'mfH8+XDG2HAzx43O8U5k0aV2C1m5TTayw8rQrHlDpPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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