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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738e3e19f3ec31dfd2441575f99bfec572dd84f087467c178af77da6e2ad7bbc' 
  AND token = 'evyOqC4COIgGvxPOfU/FRY23yhRmlM/Nr56V33Z0CXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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