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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0341ab47918d23bd39babc09928ed3fabea9deec8f4c7bde9d86ee274aa6827f' 
  AND token = 'jF4C9K1On07mtKd6HxcGHO7sLdWr5M5+cDjus9iol+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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