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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aaa190c8932a033dd6f877926a0cf69e95003d4c8c17c7ba8666c253bf9603c' 
  AND token = '4wBZ2cEN7IRyuDH6KugxvbpDzYKjTXckAn3mCFfSQZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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