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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b12042e057217cabcbdd85a8ecd47bc521e4b67616ab71cfde6f2287c6f719' 
  AND token = 'NtYwBV2VNC3xDR6x1ETUMzib8Ki5UnEJOHKc7QN9xZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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