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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae2c5874667fe42c7645c1e6a152a4ec6979727075095dadad072ddeb63de6f' 
  AND token = 'TE8/v9WsbuA8LUbLcqwB8Nr+ZQcub1hl9RioXUJMEIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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