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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506479ef064d5eb3a04bb169bd2f8501d38cd839beb616f9caa8b3fdbdb45c20' 
  AND token = 'i6oST3Bn/kRkjuHYRxdNyYBk7tw35ziIVpBljqg2ED8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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