SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5416876118b0fb968352a15e82414750a4c384ce48340296403757f6c0fb96' 
  AND token = 'PJO0+uSp/DIE0+z+3GmBsDGxsXpAoY5vaVZoEj92rxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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