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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bfe2ac687308aaa77ed78fd014d73ba7f2d98dd05cd4def3d2651cfaf01a80' 
  AND token = '2IAmSvedKd+Zlb/Ep8mIFO4zHz3ccwFB15o3uLlHu3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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