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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431e48254f27b6d6ada977ae44e88ab4b63531201d4c90dd2f6985be0a28a9ea' 
  AND token = 'tQDsYgWb7WySVv8QYQcen+IbaUopq86ETDy4LZeRcMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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