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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307d08b8d6f6f95542fcec5c9ba16d8fb3c3d856dccd53461c969a3b89dd8100' 
  AND token = 'kdl5sx38ILkK1ke69PgVlTo4QYY8qwcNiDfOPI5FQyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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