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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b605b5ae52b4c5b5914eb0b381588af18e586785f42c733842d0c80a4f317873' 
  AND token = 'Wsl3qqaW5wAmSepz4vNz2uPnrFhLTAjO9gB/fZAO3ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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