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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e6e2987b0b9deec4e5ca01052009dfd439c7fe6aa0d6c57b5c5295d50f5d9b' 
  AND token = 'HR9F/YI4O75GjdpA7uVEUi+JenlBOHd7j4L7o9oK0R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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