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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85763458274f15b047b842d120c0cc5da18cd3f893f705539fea98131a3f988' 
  AND token = 'I7ByozfWEBQAMz4qhYn4qLPJdfpWt/n8u1/V36G3My4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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