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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ae4fad6b63d53e281357a8c0f1dc7088d0f297d14a4c9193304098093f66e3' 
  AND token = 'P1BWXhEzLKs2bge+UPv5zfIG6RfdCl5mjNaBcXRzcKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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