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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5b76bcf6e135acd4f789bd9471d77d1f076ea42ca35b65a9c8893e9612316d' 
  AND token = 'SfPxNcZ/sjLxW1k6kxnCs8snG3GLQL3i2g5ep39a58g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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