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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e24c5a410c7d6539196b04e9e8b753cc3bc6259967d91e8b516a9ad9b5eade' 
  AND token = 'zmzBeq+dcoDW8gA+UoDfUibGAR62l36NEMurMhUQ+qU=' 
  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"
    }
  }
}