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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7d676b65b14a9db182e6b1e7e5bc6bb79de997d28df5d0eab3195c8ba3d2b6' 
  AND token = 'VHlACJ8SbltmKHM51f+LQxPjK5iTQks7kXMLTBaTq0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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