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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3043720ea87d38c414f0b1f7d5a53d105859a8c3c30e44c5af713307d94a9ec8' 
  AND token = 'QTvT9rYWMM8BtLoSR3mPDyr47Rl5qT3eivZLG0VgSCI=' 
  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"
    }
  }
}