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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcb76f78aee7b30da631ee533d5243e5a94cedbcb3ddef74f34836a905cc346' 
  AND token = 'JvYQYo3jH4V+P3AUMPUewqtJupQZ96c5zRkLYP0CXcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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