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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7955a200d5b8ff110f0fee467d9f303ce6d1e69f71f9dd86c1d4dc1637c3b2a' 
  AND token = 'qIv1SstWw/dhXDaw83JqcTNxWroyRpPFV0y7WyZDUAw=' 
  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"
    }
  }
}