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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9d5a59bbe6dc07f3cbec072951a981bcf1c50354958f007818302fb7021d3f' 
  AND token = 'MA/Ac9cxN9UGBNbqajfxSv4FzvevJH/8kz07H0z9tk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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