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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95fe9516c78a4b7de1e9918782a7a4a3e3c3b62c3e7f458ca0dca540585070e' 
  AND token = 'r9W0DT1N15m54kcwkyVxDlju0f/6coIKbMy2YQzoO3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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