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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a8ddd22134becdf1a614a036f36a4367b60f9521f547bea884e6ff1aeff72b' 
  AND token = 'LyEq6YBviWM07EyAU0vucQBEUSsDljTHSVGg4/zPRoM=' 
  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"
    }
  }
}