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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c852113cf134c4697738b8aebd7c7dc49424142e3cd6db87061c8babf9ee49' 
  AND token = '3pIYnEHvDP9KDpT+c7SZyn8+U6Sc8ojzDxcp/lrCMtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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