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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54324ae9c63eef40a2e049f9c646803f6d09d6eea79084f7ffa931b2051ca136' 
  AND token = 'E0Tn+XvJt4VJZT3kleMJ7LiZZpbo4lMbEv6kgAspjv0=' 
  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"
    }
  }
}