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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f376b6a35e3af1c6c7c7322023d1fd69e007cc0d94aef6ca5e8023923dbea7d' 
  AND token = 'nU12pBQ6w/jaAXCPZDsG9mIxilEgp1NI0PfpyWImCaI=' 
  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"
    }
  }
}