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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1efcf680180a74cd7c9efc2b78ff6cd399090b55cbe3c31a30b30150409eb9a' 
  AND token = 'NkCSfO0D8aBFQrtbSQAJ2eDR5HEV41k1Sw+b/O0m2HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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