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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c17ff64c039c3390644f6bf0afc0123224cc56d5e50caf1fa6cab5fbeab45f6' 
  AND token = 'Cyh2hAMj/BlZ8H8xK2QCM+S3JozcH9vlSCoPC027zfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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