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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856d48519c50726121bf9091ab98aad268345864e07fe0a4e33cd76883be8633' 
  AND token = '/IQ72jfM9mTj3rrVIXvoQvWD6XWDfGUuey3pWFWPN1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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