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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e347f697dd89158331531e82d9842c0d07e0077c10f1f72eb874218643e2f85c' 
  AND token = 'J3q2TEIIwhhv2VBoAr4FTiz8wa1v0/mgnzzwbhxPsq8=' 
  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"
    }
  }
}