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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa3e3da7ef694898f685b01d1e1116dc236bb66e3fd5764e7ed17031cf21d82' 
  AND token = 'vH9vQ46BrDJ7NfFJSbNZv4Pm/CDlwp3g+630lbyQc2w=' 
  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"
    }
  }
}