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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1628bde41fcdadb6f40466d905e948cab247a41b1d6838ce40f889e56c86da5e' 
  AND token = 'czQjdc2KtKxd4MI7qKpKn8FHKhz/O/p8HcJL8qeSCj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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