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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2988d4bfd13c0393d50569e2f662f07291e4d92fb8de36f5b7eb4f9df1889c99' 
  AND token = 'fy6U7GHqUk1+BiSW19rBXEWDUMZ9+LC2ZSonEz27OSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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