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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd8fa3707f29139255fb62c9acc721c80fec8ac00d8af0a13b014cd0e135a7a' 
  AND token = '7Z1x5tjd2swJABAM3/CRL5LnMyDJRwEEJbswrqtNjDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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