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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04473d1f80f7472b96a218071dc97ce217ceb23319c6651700a157b9f0f82001' 
  AND token = 'WhUJcV4+2YUJSWir3dKAdUBmQhwiBZwem0Qt0cIh45w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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