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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e36d2f8f91034717327c9f18cb1048643b017b2631b7f3b70ae8de4565d40a' 
  AND token = 'UMrxhNjcMJ1z9gSeLyFt6UFShC/z8eNwUKPbdAmdc7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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