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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684b0692c4a33f8e4fe45499f0517b015629a2873365fe65ad6be3d7453e387d' 
  AND token = 'TvN0tqYrCVt/TDBjE4Y4q4ODQK2SrzY66zfG0r710rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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