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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11611a45bcfeaaee82138286bfb0ead16204375b7661de9859c839dd4b236daa' 
  AND token = 'Gb49m3EzQAZuDw+9yiwSc0N3AR3W8GFBI0MCwKqgirY=' 
  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"
    }
  }
}