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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a330aec505f2a05faf6146ff390893954ad050145aab18b9db6d5eb0a16da982' 
  AND token = 'AxgT2fCy7Fq+EdwlgJk3iPoFnxLyFDAYRbkD4Cj8sJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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