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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1e4ced3ce17c7bcc1d526340f24eb777456fd01cbd47b3d7c5ab824cb1ea9e' 
  AND token = 'd7yawIVmn0yhutogLl5THdNw3YRz5dowlMaoAPWKuFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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