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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cd38ff0cdee42eadd41b82f2b27af8dcc4460122fd4e41298bc40b9c77ce13' 
  AND token = 'PLrYRPgIJBqTXky7Xmx7V/tMA0Y9TNb8cBl3EpoIcig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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