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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9738b9cd99ce7b9a687d14a3f1752f95e7626bf48b37ef3115d69c8f5e3337' 
  AND token = 'IdaWDBv/HhmDZdnpLyPHJem3sk0n99zkSjRYFD4aY5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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