SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887c07e9d59f946246423fd87a0a2fbfa98e70ed5e8b47b841ab7e468fb6ee8e' 
  AND token = '7m8J/GWI3z1swmgBeJVkpBVhGTZn20Euu/IyuCqVBvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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