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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b99b7d21c4cabedd2cf82316e7c5312b57ebd35ed0398d964bfb3fa71f094b' 
  AND token = 'Mi/NfJfqdcEFwLG6JH1YM7TFA3NetFRDwCdqHUjszsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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